Cloudening agent for producing cloudening effects in white enamels and process of producing the same.



IGNAZ KREIDL, or VIENNA, AUSTRIA-HUNGARY.

CLOUDENING AGENT FOR PRODUCING CLOUDENING EFFECTS IN WHITE ENAMELS1,101,455. 9 Dra ing.

Specification of Letters latent.

Application filed March 28, 1912.

AND PROCESS OF PRODUCING THE SAME.

Serial No. 686,888.

\ To aZZ whom it may concern Be itknown that I, Dr. IGNAZ KREIDL, asubject of the Emperor of Austria-Hungary, residing at XXI.Sebastian-Kohlgasse 5-9, Vienna, in the Empire of Austriallungary, haveinvented a new and useful C'loudening Agent for Producing CloudeningEffects in White Enamels and Process of Producing the Same, of which thefollowing is a specification.

This invention relates to cloudening agents for white enamel and toprocesses for producing said cloudening agents. Hitherto the oxids oftin, titanium, and. the oxids and silica containing compounds ofzirconium, aluminium and the like have been most commonly used forrendering enamel, and similar vitreous masses opaque.

The object of the present invention is to employ the compounds of themetals suitable for opaquing purposes in a condition which it has beenfound rendcrs them of increased value for the purpose, viz., in chemicalcombination with water.

The cloudening agent of the present invention consists of a hydratedcompound of a suitable metal, such as for example, tin, titanium,zirconium, aluminum or the like, such compound containing a smallquantity of alkali.

A suitable process for preparing a hydated zirconium OXlCl containingalkali consists in partially removin the combined alkali from analkaline zirconate produced for example by completely separating out thesilicic acid from zircon by heating with an alkaline flux or by heatingzirconium oxid with an alkaline flux by means of water and a solution ofweak acid or salt of a weak base, and subsequently drying the hydratedresidue at such a temperature that only part or none of the combinedwater is driven oft. These compounds, if prepared from natural silicatesmay contain silica. In this manner zirconium hydrates containingdiil'crcnt quantities of water are obtained. this'dcpcnding on thetemperature of drying. and in some cases with diit'crcnt quantities ofalkali.

A suitable process for preparing hydrated silica containing zirconiumcompounds containing alkali. consists in partially separating out thesilica acid from zircon by heating with an alkaline flux, such ascarbonates or hydrates of the alkalis or alkaline earths, but preferablyof sodium, in the manner already described. By similar means otherhydrated metal compounds suitable for the purpose can be prepared. Forinstance tin hydroxide may be obtained from an alkaline stannate bypartially removing the combined alkali and subsequently drying thehydrated residue.

Compounds having the constitution set out above are added to the enamelmass. The enamel mass is melted without addition of the cloudeningagent, and the cloudening agent is mixed with the ready melted andground enamel mass. Such compounds produce a cloudening'or opaquingetlect and have increased covering power. The enamel mass will beemployed in the usual way.

What is claimed is 1. An opaquing agent for White enamel comprising analkali-containing hydrated compound of a metal having opaquing properties.

2. An opaquing agent for white enamel comprising hydratedalkali-containing compound of zirconium.

3. An opaquing agent for white enamel comprising a hydratedsilica-containing compound of a metal having opaquing properties, suchcompound containing a smal quantity of alkali.

4. An opaquing agent for white enamel comprising a hydratedsilica-containing compound of zirconium, such compound containing asmall quantity of alkali.

5. An opaquing agent for white enamel comprising an alkali containinghydrated compound of a metal having opaquing properties from which thealkali has been partially but not entirely removed.

(3. An opaquing agent for white enamel comprising an alkali containinghydrate ot zirconium, from which th alkali has been partially but notentirely removed.

7. An opaquing agent for white enamel comprising an alkali containinghydrated compound of a metal having opaquingpro ei'tics, also containingsilica.

S. A process of manufzu'turing white opaquing agents for enamel,comprising partially removing combined alkali from an Patented June 23,1914.

alkali-containing hydrated compound of a metal having opaquingproperties by means of a suitable solvent,

9. A process of manufacturing White opaquing agents for enamelcomprising partially removing combined alkali from zirconates, by meansof a suitable solvent.

10. A process of manufacturing white opaquing agents from naturalsilicates of a metal the compounds of which have opaquing propertiescomprising separating out silicate acid from the silicates by means ofan alkaline agent and partially removing 'the thus combined alkali.

11. A process of manufacturing white opaquing agents comprisingseparating out silicic acid from zircon by means of an alkaline openingagent and partially removing the thus combined alkali.

12. A process of manufacturing white opaquing agents comprisingseparating out siliolc 361d from zircon by means of an alkaline openingagent and partially removing white opaguing agents comprising heatingzir-' ccnium oxid with an alkaline flux and partially removing the thuscombined alkali.

14. A process of manufacturing white opaquing agents comprisingseparating out silicic acid from the natural silicates of a metal thecompounds of which have opaquing properties, by means-of an alkalineagent, washing out the formed silicates and subsequently partiallyremoving the thus combined alkali. V

In testimony whereofI have signed my name to this specification in thepresence of two subscribing witnesses.

' DR. IGNAZ KREIDL.

WVitnesses:

' HUGO R I'K,

\ AUGUST .FUGGER.

